JP2020115716A - Timepiece and motor control method for timepiece - Google Patents

Abstract

To provide a timepiece capable of improving correction accuracy of time, and a motor control method for timepiece.SOLUTION: A motor control method has steps of: determining the direction in which a rotor is rotated by impulse on the basis of the order of timing in which an absolute value of a first induction voltage causing a first induction current which flows in the same direction as a driving current flowing to a coil, to flow to the coil exceeds a predetermined threshold, and timing in which an absolute value of a second induction voltage causing a second induction current which flows in a direction opposite to the driving current, to flow to the coil exceeds a predetermined threshold; calculating the number of times of forward rotation in which the rotor is rotated in a forward rotation direction or the number of times of backward rotation in which the rotor is rotated in a backward rotation direction on the basis of a first number of times in which the absolute value of the first induction voltage exceeds the predetermined threshold and a second number of times in which the absolute value of the second induction voltage exceeds the predetermined threshold; and stopping a process for outputting a drive pulse on the basis of the number of times of forward rotation, or executing a first correction process for outputting a reverse drive pulse based on the number of forward rotation or a second correction process for outputting a rotation correction pulse based on the number of reverse rotation.SELECTED DRAWING: Figure 1

Description

The present invention relates to a timepiece and a timepiece motor control method.

Currently, timepieces that use a stepping motor to drive the hands are widely distributed. In such a timepiece, when the pointer moves due to an impact such as a drop, the movement of the pointer causes the rotor of the stepping motor to rotate through the train wheel, and the time indicated by the pointer may shift. It may end up. As a technique for correcting the time shift that occurs in this way, there are, for example, an electronic timepiece disclosed in Patent Document 1 and an electronic timepiece disclosed in Patent Document 2.

JP-A-56-110073 JP-A-58-66887

The electronic timepiece disclosed in Patent Document 1 has an impact detection unit that detects an induced voltage generated in an electromagnetic coil when an external impact is applied while the rotor is stationary, and an output and drive of the impact detection unit. It has an impact direction discriminating means for discriminating the impact direction based on the phase of the signals, and a control means for controlling the drive signal based on the output of the impact direction discriminating means. This electronic timepiece outputs a compensating drive signal when it determines that it has received a reverse impact, and does not output a compensation drive signal when it determines that it has received a normal impact, so that the rotor rotates 180 degrees due to a reverse impact. In this case, the time difference can be corrected.

The electronic timepiece disclosed in Patent Document 2 is normally rotated by an impact depending on which of a rotation detection circuit that detects rotation of the rotor due to an impact based on an induced voltage generated in the coil and a potential at both ends of the coil is higher. A rotation direction detection circuit is provided to detect which of reverse rotation and reverse rotation has occurred. In this electronic timepiece, the waveform synthesis circuit and the drive circuit are controlled by the signals from the rotation detection circuit and the rotation direction detection circuit, so that the time display can be prevented from being distorted even if the timepiece is impacted.

However, these two electronic timepieces can correct the time difference when the rotation of the rotor due to the impact is 180 degrees (hereinafter, the rotation of 180 degrees is referred to as one step). When the rotor is rotating in a plurality of steps such as 2 steps) and 540 degrees (3 steps), it may not be possible to correct the time. Further, since an induced voltage may be generated even when the rotor is not rotating due to impact, the electronic timepiece disclosed in Patent Document 2 cannot accurately detect the rotation of the rotor or the direction of rotation. Sometimes.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a timepiece and a timepiece motor control method capable of improving time correction accuracy.

In order to achieve the above object, a timepiece according to an aspect of the present invention includes a rotor that rotates a pointer clockwise, or a rotor that rotates the pointer in a reverse direction that is a direction opposite to the normal rotation direction, and the rotor. A motor that includes a coil that generates a magnetic flux for rotating the rotor, and an absolute value of a first induced voltage that flows through the coil in the same direction as a driving current that flows through the coil has a predetermined threshold value. And the timing at which the absolute value of the second induced voltage that causes the second induced current flowing in the opposite direction to the drive current to flow through the coil exceeds the predetermined threshold value. A first direction in which the absolute value of the first induced voltage exceeds the predetermined threshold and the absolute value of the second induced voltage exceeds the predetermined threshold. A rotation speed calculation unit that calculates the number of forward rotations in which the rotor rotates in the forward rotation direction or the number of reverse rotations in which the rotor rotates in the reverse rotation direction based on the number of two times, and the coil based on the number of forward rotations. A first correction process of stopping the process of outputting a drive pulse or outputting a reverse drive pulse to the coil based on the number of forward rotations; or outputting a rotation correction pulse to the coil based on the number of reverse rotations A rotation correction unit that executes two correction processes.

Further, in the timepiece according to one aspect of the present invention, the rotation correction unit performs a process of outputting the drive pulse to the coil in the normal rotation rotation in the first correction processing when the normal rotation count is 1 or more. Stop for the same number of times.

Further, in the timepiece according to one aspect of the present invention, when the number of times of forward rotation is 1 or more, the rotation correction unit reversely drives the coil by the same number of times as the number of times of forward rotation in the first correction process. Output a pulse.

Further, in the timepiece according to one aspect of the present invention, the rotation correction unit performs a process of outputting the rotation correction pulse to the coil in the second correction process when the number of reverse rotations is 1 or more. Do the same number of times as.

Further, in the timepiece according to one aspect of the present invention, the rotation speed calculation unit calculates the normal rotation frequency by subtracting 2 from the sum of the first frequency and the second frequency.

In the timepiece according to one aspect of the present invention, the rotation speed calculation unit calculates the number of times of reverse rotation by subtracting 1 from the sum of the first number of times and the second number of times.

Further, in the timepiece according to one aspect of the present invention, when the absolute value of the first induced voltage exceeds the predetermined threshold value before the absolute value of the second induced voltage exceeds the predetermined threshold value, It is determined that the rotor has rotated in the forward rotation direction.

Further, in the timepiece according to one aspect of the present invention, the rotation direction determination unit, when the absolute value of the second induced voltage exceeds the predetermined threshold value before the absolute value of the first induced voltage, It is determined that the rotor has rotated in the reverse rotation direction.

In order to achieve the above object, a timepiece motor control method according to an aspect of the present invention rotates a rotor in a forward rotation direction in which a pointer is rotated clockwise or in a reverse rotation direction that is a direction opposite to the forward rotation direction. The timing at which the absolute value of the first induced voltage flowing in the coil of the first induced current flowing in the same direction as the driving current flowing in the coil that generates the magnetic flux exceeds a predetermined threshold, and the direction opposite to the driving current. Direction determining step for determining the direction in which the rotor rotates due to impact based on the order of the timing at which the absolute value of the second induced voltage flowing through the coil of the second induced current flowing through the coil exceeds the predetermined threshold value. And a second number of times when the absolute value of the first induced voltage exceeds the predetermined threshold value and a second number of times when the absolute value of the second induced voltage exceeds the predetermined threshold value, the rotor is rotated in the forward rotation direction. Rotation number calculation step for calculating the number of forward rotations rotated in the reverse direction or the number of reverse rotations in which the rotor rotates in the reverse rotation direction, and stopping the process of outputting a drive pulse to the coil based on the number of forward rotations, or A rotation correction step of executing a first correction process of outputting a reverse drive pulse to the coil based on the number of turns, or a second correction process of outputting a rotation correction pulse to the coil based on the number of reverse rotation. Including.

According to the present invention, it is possible to provide a timepiece and a timepiece motor control method capable of improving the time correction accuracy.

It is a figure which shows an example of a structure of the timepiece which concerns on embodiment. It is a figure which shows an example of the motor drive circuit and stepping motor which concern on embodiment. It is a figure which shows an example of the signal generated in each of the two terminals of a coil when rotating the rotor which concerns on embodiment, and the gate signal input into the gate of a transistor in order to generate these signals. It is a figure which shows an example of the state which the rotor which concerns on embodiment rotates 1 step to the normal rotation direction from the state shown in FIG. 2, and is free-oscillating. 5 is an example of a drive pulse, an induced voltage, and a correction drive pulse in the case shown in FIG. 4, and a gate signal input to the gate of a transistor to generate these three signals. FIG. 3 is a diagram showing an example of a case in which the rotor of the embodiment shown in FIG. 2 is rotated in the forward direction by one step, and then the impact of rotating the rotor in the forward direction by one step is applied to the timepiece according to the embodiment. FIG. 7 is a diagram showing an example of a gate signal input to the gate of the transistor and an induced voltage generated at each of the two terminals of the coil in the case shown in FIG. 6. FIG. 4 is a diagram showing an example of a case in which the rotor of the embodiment shown in FIG. 2 is rotated in the forward direction by one step, and then the impact of rotating the rotor in the reverse direction by one step is applied to the timepiece according to the embodiment. It is a figure which shows an example of the induced voltage generated in each of two terminals of a coil in the case shown in FIG. It is a figure for demonstrating the method by which the timepiece which concerns on embodiment determines the direction which a rotor rotates by impact. FIG. 6 is a diagram showing an example of a correspondence relationship between the number of forward rotations of a rotor due to an impact and the behavior of the rotor when an impact is applied and an induced voltage induced in a terminal of a coil. FIG. 7 is a diagram showing an example of a correspondence relationship between the number of times of reverse rotation of the rotor due to an impact and the behavior of the rotor when an impact is applied and the induced voltage induced in the terminals of the coil. It is a flow chart which shows an example of processing which a timepiece concerning an embodiment performs.

An example of the timepiece according to the embodiment will be described with reference to FIGS. 1 to 12. FIG. 1 is a diagram showing an example of the configuration of the timepiece according to the embodiment. As shown in FIG. 1, the timepiece 1 includes an oscillation circuit 101, a frequency dividing circuit 102, a control circuit 103, a main drive pulse generation circuit 104, a correction drive pulse generation circuit 105, a motor drive circuit 106, and a stepping circuit. A motor 107, a watch case 108, an analog display unit 109, a movement 110, a pointer 111, a calendar display unit 112, a rotation detection circuit 113, a rotation direction determination circuit 114, a rotation speed calculation circuit 115, and a rotation. And a correction circuit 116.

The oscillator circuit 101 generates a signal having a predetermined frequency and transmits it to the frequency dividing circuit 102. The frequency divider circuit 102 divides the signal received from the oscillator circuit 101 to generate a clock signal which serves as a reference for measuring time, and transmits the clock signal to the control circuit 103. The control circuit 103 transmits a control signal to each unit of the timepiece 1 based on the clock signal or the like received from the frequency dividing circuit 102, and controls these operations.

The main drive pulse generation circuit 104 generates a main drive pulse for driving the stepping motor 107 based on the control signal received from the control circuit 103, and outputs the main drive pulse to the motor drive circuit 106. The main drive pulse is a comb-teeth-shaped voltage pulse that is output to rotate the rotor 202 of the stepping motor 107, which will be described later, in one step, that is, to rotate in the forward rotation direction of 180 degrees. The normal direction referred to here is the direction in which the rotor 202 described below rotates in order to rotate the pointer 111 clockwise. On the other hand, the reverse rotation direction is opposite to the normal rotation direction.

The correction drive pulse generation circuit 105 generates a correction drive pulse for driving the stepping motor 107 based on the control signal received from the control circuit 103, and outputs the correction drive pulse to the motor drive circuit 106. The correction drive pulse is a voltage pulse that is output when the rotor 202 of the stepping motor 107 described later does not rotate in the forward rotation direction due to the main drive pulse, and has a larger duty ratio than the main drive pulse. More energy than.

FIG. 2 is a diagram illustrating an example of the motor drive circuit and the stepping motor according to the embodiment. As shown in FIG. 2, the motor drive circuit 106 includes a transistor TP1, a transistor TP2, a transistor TP3, a transistor TP4, a transistor TN1, a transistor TN2, a detection resistor Rs1, a detection resistor Rs2, and a terminal OUT1. , Terminal OUT2.

The transistor TP1, the transistor TP2, the transistor TP3, and the transistor TP4 are P-channel metal-oxide-semiconductor field-effect transistors (MOSFETs), which are turned on when receiving a low-level gate signal and receive a high-level gate signal. Then it turns off. The transistors TN1 and TN2 are N-channel MOSFETs, which are turned off when receiving a low-level gate signal and turned on when receiving a high-level gate signal. The high-level potential is equal to VDD, which is the power supply voltage of the motor drive circuit 106. The low-level potential is 0 V or a potential equal to VSS which is the reference voltage.

The sources of the transistor TP1, the transistor TP2, the transistor TP3, and the transistor TP4 are electrically connected to each other, and VDD, which is the power supply voltage of the motor drive circuit 106, is supplied. The drain of the transistor TP3 is electrically connected to one end of the detection resistor Rs1. The drain of the transistor TP1, the drain of the transistor TN1, and the other end of the detection resistor Rs1 are electrically connected to the terminal OUT1. The drain of the transistor TP4 is electrically connected to one end of the detection resistor Rs2. The drain of the transistor TP2, the drain of the transistor TN2, and the other end of the detection resistor Rs2 are electrically connected to the terminal OUT2. The sources of the transistor TN1 and the transistor TN2 are electrically connected to each other and supplied with 0V or a reference voltage VSS. The terminals OUT1 and OUT2 are connected to the input terminals of a comparator (not shown). Furthermore, a reference voltage Vcomp described later is input to the reference input terminal of this comparator.

As shown in FIG. 2, the stepping motor 107 includes a stator 201, a rotor 202, a rotor housing through hole 203, an inner notch 204, an inner notch 205, an outer notch 206, an outer notch 207, and a magnetic core 208. And a coil 209.

The stator 201 is a U-shaped curved member made of a magnetic material. The rotor 202 is formed in a cylindrical shape and is rotatably inserted into the rotor housing through hole 203 formed in the stator 201. Further, since the rotor 202 is magnetized, it has N poles and S poles. The rotor 202 rotates in the forward direction to rotate the pointer 111 clockwise through the train wheel, and rotates in the reverse direction to rotate the pointer 111 counterclockwise through the train wheel.

The inner notch 204 and the inner notch 205 are notches formed on the wall surface of the rotor housing through hole 203, and determine the stop position of the rotor 202 with respect to the stator 201. That is, for example, as shown in FIG. 2, when the coil 209 is not excited, the rotor 202 stands still at a position where the magnetic pole axis is orthogonal to the line segment connecting the inner notches 204 and 205.

The outer notch 206 and the outer notch 207 are notches formed inside and outside the curved stator 201, respectively, and form a supersaturated portion with the through hole 203 for housing the rotor. Here, the supersaturated portion is a portion that is not magnetically saturated by the magnetic flux of the rotor 202, but is magnetically saturated when the coil 209 is excited and the magnetic resistance increases.

The magnetic core 208 is a rod-shaped member made of a magnetic material, and is joined to both ends of the stator 201. The coil 209 is wound around the magnetic core 208 and has one end connected to the terminal OUT1 and the other end connected to the terminal OUT2.

FIG. 3 is a diagram showing an example of signals generated at the two terminals of the coil when the rotor according to the embodiment is rotated and a gate signal input to the gate of the transistor for generating these signals.

When the motor drive circuit 106 is stationary with the magnetic pole axis of the rotor 202 orthogonal to the line segment connecting the inner notches 204 and 205, for example, the transistor TP1, the transistor TP2, the transistor TP3, the transistor TP4, The gate signal shown on the left side of FIG. 3 is output to the transistors TN1 and TN2.

As a result, the transistor TP1 receives the low level gate signal and is turned on. The transistors TP3 and TP4 are turned off upon receiving the high level gate signal. Further, the transistor TN1 receives a low level gate signal and is turned off. Further, the transistors TP2 and TN2 receive the comb-shaped gate signal and repeat on and off.

In this case, as shown in FIG. 3, the voltage of the terminal OUT1 becomes high level, and the comb-teeth drive pulse is output to the terminal OUT2. Then, as shown in FIG. 2, the drive current Idrv flows through the path of VDD, the transistor TP1, the terminal OUT1, the coil 209, the terminal OUT2, the transistor TN2, and VSS, and the magnetic flux Φ _C is generated in the coil 209. The N pole and the S pole of the rotor 202 repel the N pole and the S pole generated in the stator 201 by the magnetic flux Φ _C, so that the rotor 202 moves from the θ ₀ direction to the θ ₁ direction as shown by a locus r1 in FIG. Rotate in the direction. This rotation is an example of one-step rotation in the forward rotation direction. Therefore, it can be said that the drive current Idrv is a current that flows to rotate the rotor 202 one step in the forward rotation direction before the direction in which the rotor 202 rotates due to an impact is determined.

Next, in the case where the N pole of the rotor 202 faces the θ ₁ direction, the motor drive circuit 106, for example, for the transistor TP1, the transistor TP2, the transistor TP3, the transistor TP4, the transistor TN1, and the transistor TN2 of FIG. It outputs the gate signal shown on the right.

As a result, the transistor TP2 receives the low level gate signal and is turned on. The transistors TP3 and TP4 are turned off upon receiving the high level gate signal. Further, the transistor TN2 receives the low level gate signal and is turned off. Further, the transistors TP1 and TN1 receive the comb-shaped gate signal and repeat on and off.

In this case, as shown in FIG. 3, the voltage of the terminal OUT2 becomes high level, and the comb-teeth drive pulse is output to the terminal OUT1. Then, a drive current flows through the path of VDD, the transistor TP2, the terminal OUT2, the coil 209, the terminal OUT1, the transistor TN1, and VSS, and a magnetic flux in the opposite direction to the magnetic flux Φ _C is generated in the coil 209. The N-pole and the S-pole of the rotor 202 repel the N-pole and the S-pole generated in the stator 201 by the magnetic flux, so that the rotor 202 rotates from the θ ₁ direction to the θ ₀ direction. This rotation is an example of one-step rotation in the forward rotation direction. Therefore, when the above-described drive current Idrv flows and the direction of the N pole of the rotor 202 is opposite, this drive current causes the rotor 202 to rotate in the forward rotation direction before the direction in which the rotor 202 rotates due to an impact is determined. It can be said that this is the current that flows to rotate one step.

Returning to FIG. 1, the watch case 108 includes an oscillator circuit 101, a frequency divider circuit 102, a control circuit 103, a main drive pulse generation circuit 104, a correction drive pulse generation circuit 105, a motor drive circuit 106, a stepping motor 107, and an analog display unit 109. , A movement 110, a pointer 111, a calendar display unit 112, a rotation detection circuit 113, a rotation direction determination circuit 114, a rotation speed calculation circuit 115, and a rotation correction circuit 116.

The analog display unit 109 is a dial with engraved scales. The movement 110 is a mechanical mechanism for driving each part of the timepiece 1. The pointer 111 includes an hour hand, a minute hand, a second hand and other hands. The calendar display unit 112 is driven by the stepping motor 107 and displays the date.

The rotation detection circuit 113 detects the rotation of the rotor 202 that is normally driven without the impact such as the drop of the timepiece 1. FIG. 4 is a diagram showing an example of a state in which the rotor according to the embodiment rotates one step in the forward direction from the state shown in FIG. 2 and is freely vibrating. FIG. 5 shows an example of the drive pulse, the induced voltage, and the correction drive pulse in the case shown in FIG. 4, and the gate signal input to the gate of the transistor in order to generate these three signals. In the following description, the I quadrant, the II quadrant, the III quadrant, and the IV quadrant, which are divided by the X direction and the Y direction shown in FIG. 4, are used. Further, as shown in FIG. 4, a horizontal magnetic pole is provided at the boundary (X axis in the figure) between the region formed by the quadrants I and II and the region formed by the quadrants III and IV. positioned.

The motor drive circuit 106 outputs the drive signal P1 shown in FIG. 5 to the terminal OUT2 by outputting a gate signal similar to the gate signal shown on the left side of FIG. As a result, a drive current flows through the path of VDD, the transistor TP1, the terminal OUT1, the coil 209, the terminal OUT2, the transistor TN2, and VSS, and a magnetic flux is generated in the coil 209. The N-pole and the S-pole of the rotor 202 repel the N-pole and the S-pole generated in the stator 201 by the magnetic flux, so that the rotor 202 has the locus r1, the locus r2, and the locus r3 shown in FIG. , Θ ₀ direction to θ ₁ direction.

The locus r1 exceeds the maximum point of the magnetic potential formed by the inner notch 205 from the state where the rotor 202 has the north pole in the direction of θ ₀ , and reaches the boundary between the second quadrant and the third quadrant. It shows the situation. Further, the drive pulse P1 is output while the rotor 202 continues to rotate represented by the locus r1. The locus r2 has a clockwise angular velocity from the state in which the N pole of the rotor 202 is located at the boundary between the second quadrant and the third quadrant to the state in which the rotor 202 directs the N pole in the direction of θ _1. It shows how it rotates until it reaches zero. A locus r3 represents a state in which the rotor 202 rotates counterclockwise after the clockwise angular velocity becomes zero. After that, the rotor 202 repeats rotation in the clockwise direction and rotation in the counterclockwise direction until the kinetic energy is exhausted.

The motor drive circuit 106 is shown in FIG. The gate signal shown in is output.

As a result, the transistors TP1 and TP4 receive the low level gate signal and are turned on. The transistor TP3 receives the high level gate signal and is turned off. The transistors TN1 and TN2 are turned off upon receiving a low level gate signal. Then, the transistor TP2 receives the comb-shaped gate signal and repeats turning on and off. The comb-shaped gate signal is called a chopper signal.

In this case, as shown in FIG. 5, the voltage of the terminal OUT1 becomes a high level, and while the rotor 202 continues to rotate represented by the locus r2, a spike-like voltage response higher than the high level is output to the terminal OUT2. To be done. This spike-like voltage response is shown in FIG. 5, and is a response obtained by amplifying and detecting the induced current Irs1 flowing in the same direction as the drive current by the chopper signal, and the magnitude of the voltage is It is limited to a certain value or less by the parasitic diode of the transistor TP2. The process of amplifying the signal with the chopper signal is called chopper amplification.

Further, as shown in FIG. 5, while the rotor 202 continues to rotate represented by the locus r3, a spike-like voltage response lower than the high level is output to the terminal OUT2. These spike-shaped voltage responses are shown in FIG. 5, and are responses obtained by amplifying and detecting the induced current Irs2 flowing in the direction opposite to the drive current by the chopper signal. The rotation detection circuit 113 determines that the rotor 202 has rotated one step when the absolute values of these spike-shaped voltage responses exceed the reference voltage Vcomp. That is, when the rotor 202 normally rotates in the forward rotation direction without rotating in the forward rotation direction or the reverse rotation direction due to an impact such as a drop, the absolute value exceeds the reference voltage Vcomp each time a drive pulse is output once. A spike-like voltage response is detected once. On the other hand, the rotation detection circuit 113 determines that the rotor 202 is not rotating when the absolute value of these spike-shaped voltage responses is equal to or less than the reference voltage Vcomp. The reference voltage Vcomp mentioned here is, for example, as shown in FIG. 5, 0 V or a potential equal to VSS which is the reference voltage.

When it is determined that the rotor 202 is rotating, the control circuit 103 continues normal control. On the other hand, when it is determined that the rotor 202 is not rotating, the control circuit 103 controls the correction drive pulse generation circuit 105 and the motor drive circuit 106, and, for example, the correction drive pulse P2 or the correction drive pulse shown in FIG. Output Pr to the terminal OUT2.

Specifically, the motor drive circuit 106 outputs the gate signal shown in FIG. 5 to the transistor TP1, the transistor TP2, the transistor TP3, the transistor TP4, the transistor TN1 and the transistor TN2, for example. As a result, the transistor TP1 receives the low level gate signal and is turned on. The transistors TP2, TP3, and TP4 receive the high-level gate signal and are turned off. The transistor TN1 is turned off upon receiving the low level gate signal. The transistor TN2 receives the high level gate signal and is turned on. In this case, as shown in FIG. 5, the voltage of the terminal OUT1 becomes high level, and the correction drive pulse P2 is output to the terminal OUT2.

Alternatively, the motor drive circuit 106 outputs the gate signal shown in FIG. 5 to the transistor TP1, the transistor TP2, the transistor TP3, the transistor TP4, the transistor TN1 and the transistor TN2, for example. As a result, the transistor TP1 receives the low level gate signal and is turned on. The transistors TP3 and TP4 are turned off upon receiving the high level gate signal. The transistor TN1 is turned off upon receiving the low level gate signal. The transistor TP2 and the transistor TN2 receive the comb-shaped gate signal and repeat on and off. In this case, as shown in FIG. 5, the voltage of the terminal OUT1 becomes high level, and the comb-teeth-shaped correction drive pulse Pr is output to the terminal OUT2.

Further, the rotation detection circuit 113 detects the rotation of the rotor 202 due to an impact such as a drop applied to the timepiece 1. FIG. 6 shows an example of a case in which, after the rotor has been rotated one step in the forward direction from the state shown in FIG. 2, the impact of rotating the rotor by one step in the forward direction is applied to the timepiece according to the embodiment. It is a figure. FIG. 7 is a diagram showing an example of the gate signal input to the gate of the transistor and the induced voltage generated at each of the two terminals of the coil in the case shown in FIG.

The motor drive circuit 106 outputs the gate signal shown in FIG. 7 to the transistor TP1, the transistor TP2, the transistor TP3, the transistor TP4, the transistor TN1 and the transistor TN2, for example.

Accordingly, the transistors TP3 and TP4 receive the low level gate signal and are turned on. Further, the transistors TN1 and TN2 are turned off upon receiving a low-level gate signal. Furthermore, the transistors TP1 and TP2 receive a periodic gate signal and repeat turning on and off. This periodic gate signal is called a chopper signal. Further, for example, as shown in FIG. 7, the periodic gate signal has a period of 244 microseconds and a high level time per cycle is 30.5 microseconds.

While the transistor TP1 and the transistor TP2 are on, the first induced current Irs3 and the second induced current Irs4 shown in FIG. 7 pass through the transistor TP1, the terminal OUT1, the coil 209, the terminal OUT2, and the transistor TP2 in the first path. Flowing through. On the other hand, while the transistors TP1 and TP2 are off, the first induced current Irs3 and the second induced current Irs4 shown in FIG. 7 are the same as the transistor TP3, the detection resistor Rs1, the terminal OUUT1, the coil 209, the terminal OUUT2, and the detection. It flows through the second path that passes through the resistor Rs2 and the transistor TP4.

The impedance in the path increases at the moment when the transistors TP1 and TP2 switch from on to off, that is, at the moment when the path through which the first induced current Irs3 or the second induced current Irs4 flows changes from the first path to the second path. As a result, as shown in FIG. 7, a spike-like voltage response is output to the terminals OUT1 and OUT2.

When the absolute values of these spike-shaped voltage responses exceed the reference voltage Vcomp, the rotation detection circuit 113 determines that the rotor 202 has rotated due to an impact such as a drop applied to the timepiece 1, and these spike-shaped voltages are detected. When the absolute value of the voltage response of is less than or equal to the reference voltage Vcomp, it is determined that the rotor 202 is not rotating due to the impact. The reference voltage Vcomp here is, for example, as shown in FIG. 7, an arbitrary voltage between 0V or VSS which is the reference voltage and VDD which is the power supply voltage of the motor drive circuit 106.

The rotation direction determination circuit 114 determines the rotation direction of the rotor 202. Specifically, when the absolute value of the first induced voltage exceeds the predetermined threshold value before the absolute value of the second induced voltage, the rotation direction determination circuit 114 causes the rotor 202 to rotate in the forward direction due to an impact. To determine. Further, the rotation direction determination circuit 114 determines that the rotor 202 has rotated in the reverse rotation direction due to an impact when the absolute value of the second induced voltage exceeds the predetermined threshold value before the absolute value of the first induced voltage. Here, the first induced voltage is the voltage that causes the first induced current Irs3 shown in FIG. 6 to flow through the coil 209. The second induced voltage is a voltage that causes the second induced current Irs4 shown in FIG. 6 to flow in the coil 209. The first induced current Irs3 is a current flowing in the same direction as the drive current. The second induced current Irs4 is a current flowing in the direction opposite to the drive current.

A locus r4 in FIG. 6 shows how the rotor 202 rotates in the forward direction from the state in which the north pole is oriented in the direction of θ ₁ to the boundary between the quadrant IV and the quadrant I. In this case, the first induced current Irs3 flows in the same direction as the drive current Idrv shown in FIG. As shown in FIG. 7, the first induced voltage corresponding to the first induced current Irs3 is output to the terminal OUUT1 as a spike-like voltage response lower than the high level, and the spike-like voltage response higher than the high level. Is output to the terminal OUT2. Further, as shown in FIG. 7, a part of the first induced voltage output to the terminal OUT1 exceeds the reference voltage Vcomp. The first induced voltage output to the terminal OUT2 is limited to a certain value or less by the parasitic diode of the transistor TP2.

The locus r5 in FIG. 6 shows the state after the rotor 202 directs the N pole in the direction of the boundary between the IV quadrant and the I quadrant, and the state where the rotor 202 directs the N pole in the direction of θ _0. It shows a state of rotating up to the front of the notch 206. In this case, the second induced current Irs4 flows in the direction opposite to the drive current Idrv shown in FIG. The second induced voltage corresponding to the second induced current Irs4 is output to the terminal OUT2 as a spike-like voltage response lower than the high level as shown in FIG. 7, and the spike-like voltage response higher than the high level. Is output to the terminal OUT1. In addition, as shown in FIG. 7, a part of the second induced voltage output to the terminal OUT2 exceeds the reference voltage Vcomp. The second induced voltage output to the terminal OUT1 is limited to a certain value or less by the parasitic diode of the transistor TP1.

A locus r6 in FIG. 6 shows how the rotor 202 rotates clockwise after the counterclockwise angular velocity becomes zero. In this case, the first induced current Irs3 flows in the same direction as the drive current Idrv shown in FIG. 2, as in the case where the rotor 202 is in the rotating state represented by the locus r4 shown in FIG. As shown in FIG. 7, the first induced voltage corresponding to the first induced current Irs3 is output to the terminal OUT1 as a spike-shaped voltage response lower than the high level, and the spike-shaped voltage response higher than the high level. Is output to the terminal OUT2. Further, as shown in FIG. 7, a part of the first induced voltage output to the terminal OUT1 exceeds the reference voltage Vcomp. The first induced voltage output to the terminal OUT2 is limited to a certain value or less by the parasitic diode of the transistor TP2.

As described above, when a shock is applied to the timepiece according to the embodiment after rotating the rotor 1 step in the forward rotation direction from the state shown in FIG. The first induced voltage whose value exceeds the reference voltage Vcomp is output to the terminal OUT1, the second induced voltage whose absolute value exceeds the reference voltage Vcomp is output to the terminal OUT2, and the first induced voltage whose absolute value exceeds the reference voltage Vcomp again. The induced voltage is output to the terminal OUT1. When detecting this phenomenon, the rotation direction determination circuit 114 determines that the rotor 202 has rotated one step in the normal rotation direction due to an impact such as a drop.

FIG. 8 is a diagram showing an example of a case where a shock is applied to the timepiece according to the embodiment after rotating the rotor in the forward direction by one step from the state shown in FIG. 2 and then rotating the rotor in the reverse direction by one step. Is. FIG. 9 is a diagram showing an example of the induced voltage generated at each of the two terminals of the coil in the case shown in FIG.

The motor drive circuit 106 outputs a gate signal similar to the gate signal shown in FIG. 7 to the transistor TP1, the transistor TP2, the transistor TP3, the transistor TP4, the transistor TN1, and the transistor TN2, for example. As a result, these six transistors operate in the same manner as described with reference to FIGS. 6 and 7. Further, the rotation detection circuit 113 determines whether or not the rotor 202 is rotated by an impact such as a drop applied to the timepiece 1 in the same manner as described with reference to FIGS. 6 and 7.

The rotation direction determination circuit 114 determines the rotation direction of the rotor 202. A locus r7 in FIG. 8 represents how the rotor 202 rotates in the reverse direction from the state in which the N pole is directed in the direction of θ ₁ to the boundary between the third quadrant and the second quadrant. In this case, the second induced current Irs4 flows in the direction opposite to the drive current Idrv shown in FIG. As shown in FIG. 9, the second induced voltage corresponding to the second induced current Irs4 is output to the terminal OUT2 as a spike-like voltage response lower than the high level, and the spike-like voltage response higher than the high level. Is output to the terminal OUT1. As shown in FIG. 9, the second induced voltage output to the terminal OUT2 partially exceeds the reference voltage Vcomp, but the angular velocity of the rotor 202 is slow and the angular range of the locus r7 is narrow. The range over the voltage Vcomp is narrow. The second induced voltage output to the terminal OUT1 is limited to a certain value or less by the parasitic diode of the transistor TP1.

The locus r8 in FIG. 8 indicates that the rotor 202 has its north pole in the direction of the boundary between the third quadrant and the second quadrant, and the rotor 202 has its north pole in the direction of θ _0. It shows how it rotates until the angular velocity around it becomes zero. In this case, the first induced current Irs3 flows in the same direction as the drive current Idrv shown in FIG. As shown in FIG. 9, the first induced voltage corresponding to the first induced current Irs3 is output to the terminal OUT1 as a spike-like voltage response lower than the high level, and the spike-like voltage response higher than the high level. Is output to the terminal OUT2. Further, as shown in FIG. 9, a part of the first induced voltage output to the terminal OUT1 exceeds the reference voltage Vcomp. The first induced voltage output to the terminal OUT2 is limited to a certain value or less by the parasitic diode of the transistor TP2.

A locus r9 in FIG. 8 shows how the rotor 202 rotates counterclockwise after the clockwise angular velocity becomes zero. In this case, as in the case where the rotor 202 is in the rotating state represented by the locus r7 shown in FIG. 8, the second induced current Irs4 flows in the direction opposite to the drive current Idrv shown in FIG. As shown in FIG. 9, the second induced voltage corresponding to the second induced current Irs4 is output to the terminal OUT2 as a spike-like voltage response lower than the high level, and the spike-like voltage response higher than the high level. Is output to the terminal OUT1. Further, as shown in FIG. 9, the second induced voltage of the terminal OUT2 does not exceed Vcomp, and the second induced voltage output to the terminal OUT1 is limited to a certain value or less by the parasitic diode of the transistor TP1.

As described above, when an impact is applied to the timepiece according to the embodiment after rotating the rotor in the forward direction by one step from the state shown in FIG. Is output to the terminal OUT2, the first induced voltage whose absolute value exceeds the reference voltage Vcomp is output to the terminal OUT1, and thereafter the absolute value of the second induced voltage is the reference. Do not exceed the voltage Vcomp. When detecting this phenomenon, the rotation direction determination circuit 114 determines that the rotor 202 has rotated one step in the reverse rotation direction due to an impact such as a drop.

The method of determining the rotation direction of the rotor 202 described with reference to FIGS. 6 to 9 can be summarized as shown in the table of FIG. FIG. 10 is a diagram for explaining a method of determining the direction in which the rotor rotates due to the impact of the timepiece according to the embodiment. As shown in FIG. 10, in the rotation direction determination circuit 114, when the induced current whose absolute value exceeds the reference voltage Vcomp is the first induced current after the drive pulse is output, the rotor 202 receives an impact. It is determined that the rotating direction is the normal direction. On the other hand, when the induced current whose absolute value exceeds the reference voltage Vcomp is the second induced current after the drive pulse is output, the rotating direction determination circuit 114 reverses the direction in which the rotor 202 receives a shock and rotates. It is determined to be the direction.

The rotation speed calculation circuit 115 causes the rotor to rotate in the forward rotation direction based on the first number of times when the absolute value of the first induced voltage exceeds the predetermined threshold value and the second number of times when the absolute value of the second induced voltage exceeds the predetermined threshold value. The number of normal rotations that have rotated or the number of reverse rotations that the rotor has rotated in the reverse direction is calculated.

FIG. 11 is a diagram showing an example of a correspondence relationship between the number of forward rotations of the rotor due to the impact and the behavior of the rotor when the impact is applied and the induced voltage induced at the terminals of the coil. The correspondence relationship shown in FIG. 11 can be derived from the same consideration as the content described with reference to FIGS. 6 and 7.

FIG. 11A shows a case where the rotor 202 has received a small impact after rotating one step in the normal direction from the state shown in FIG. 2 but has not rotated even one step in the normal direction. In this case, the first induced voltage whose absolute value is less than or equal to the reference voltage Vcomp is first output to the terminal OUT1, and the second induced voltage whose absolute value is less than or equal to the reference voltage Vcomp is output to the terminal OUT2 and the absolute value again. The first induced voltage whose voltage is less than or equal to the reference voltage Vcomp is output to the terminal OUT1.

In this case, the rotation speed calculation circuit 115 determines that the rotor 202 has rotated in the forward rotation direction because the first rotation count is “0” and the second rotation count is “0”. It cannot be determined that. However, in this case, there is no problem because the rotor 202 is not rotating in the forward rotation direction or the reverse rotation direction.

FIG. 11B shows a case where the rotor 202 has received a large impact after rotating 1 step in the normal direction from the state shown in FIG. 2 but has not rotated even 1 step in the normal direction. It shows a case where the number exceeds 207 but does not exceed the inner notch 204. In this case, the first induced voltage whose absolute value exceeds the reference voltage Vcomp is first output to the terminal OUT1, then the second induced voltage whose absolute value exceeds the reference voltage Vcomp is output to the terminal OUT2, and finally A first induced voltage whose absolute value is less than or equal to the reference voltage Vcomp is output to the terminal OUT1. The reason why the absolute value of the first induced voltage output first and the absolute value of the second induced voltage output subsequently exceed the reference voltage Vcomp is that the N pole of the rotor 202 is oversaturated by the outer notch 207. This is because these absolute values become large by passing through the section.

In this case, the rotation speed calculation circuit 115 determines that the rotor 202 has rotated 0 steps in the forward direction based on the first number of times being “1” and the second number of times being “1”. Specifically, the rotation speed calculation circuit 115 rotates in the forward direction by "0" steps by subtracting the constant "2" from the sum "2" of the first number "1" and the second number "1". And calculate.

FIG. 11C shows that when the rotor 202 rotates one step in the normal rotation direction from the state shown in FIG. 2 and then receives an impact and rotates one step in the normal rotation direction, for example, before the outer notch 206 is positive. The figure shows the case of rotation in the rolling direction. In this case, the first induced voltage whose absolute value exceeds the reference voltage Vcomp is first output to the terminal OUT1, and then the second induced voltage whose absolute value exceeds the reference voltage Vcomp is output to the terminal OUT2. The first induced voltage whose absolute value exceeds the reference voltage Vcomp is output to the terminal OUT1, and finally the second induced voltage whose absolute value is less than or equal to the reference voltage Vcomp is output to the terminal OUT2.

In this case, the rotation speed calculation circuit 115 determines that the rotor 202 has rotated one step in the forward rotation direction based on the first number of times being “2” and the second number of times being “1”. Specifically, the rotation speed calculation circuit 115 rotates in the forward direction by "1" step by subtracting the constant "2" from the sum "3" of the first number "2" and the second number "1". And calculate.

FIG. 11D shows a case where the rotor 202 rotates one step in the normal rotation direction from the state shown in FIG. 2 and then receives a shock and rotates two steps in the normal rotation direction. In this case, in this case, the first induced voltage whose absolute value exceeds the reference voltage Vcomp is first output to the terminal OUT1, and then the second induced voltage whose absolute value exceeds the reference voltage Vcomp is output to the terminal OUT2. Then, the first induced voltage whose absolute value exceeds the reference voltage Vcomp is output to the terminal OUT1, the second induced voltage whose absolute value exceeds the reference voltage Vcomp is output to the terminal OUT2, and finally The first induced voltage whose absolute value is less than or equal to the reference voltage Vcomp is output to the terminal OUT1.

In this case, the rotation speed calculation circuit 115 determines that the rotor 202 has rotated two steps in the forward rotation direction based on the first number of times being “2” and the second number of times being “2”. Specifically, the rotation speed calculation circuit 115 rotates in the forward rotation direction by "2" steps by subtracting the constant "2" from the sum "4" of the first number "2" and the second number "2". And calculate.

From FIGS. 11C and 11D, when the rotor 202 is rotated in the normal direction due to an impact such as a drop, the absolute value of the reference voltage Vcomp is calculated every time the rotor 202 normally rotates for one step (180 degrees). It can be seen that a spike-like voltage response exceeding 1 is detected three or more times.

FIG. 12 is a diagram showing an example of a correspondence relationship between the number of reverse rotations of the rotor due to the impact and the behavior of the rotor when the impact is applied and the induced voltage induced at the terminals of the coil. The correspondence relationship shown in FIG. 12 can be derived from the same consideration as the content described with reference to FIGS. 8 and 9.

FIG. 12A shows a case where the rotor 202 has received an impact after rotating one step in the forward rotation direction from the state shown in FIG. 2, but has not rotated even one step in the reverse rotation direction. In this case, first, the second induced voltage whose absolute value is less than or equal to the reference voltage Vcomp is output to the terminal OUT2, and then the first induced voltage whose absolute value is less than or equal to the reference voltage Vcomp is output to the terminal OUT1 and again the absolute value. The second induced voltage whose voltage is equal to or lower than the reference voltage Vcomp is output to the terminal OUT2.

In this case, the rotation speed calculation circuit 115 determines that the rotor 202 has rotated in the forward rotation direction because the first rotation count is “0” and the second rotation count is “0”. It cannot be determined that. However, in this case, there is no problem because the rotor 202 is not rotating in the forward rotation direction or the reverse rotation direction.

FIG. 12B shows a case where the rotor 202 rotates one step in the forward rotation direction from the state shown in FIG. 2 and then receives an impact and rotates one step in the reverse rotation direction. In this case, first the second induced voltage whose absolute value exceeds the reference voltage Vcomp is output to the terminal OUT2, then the first induced voltage whose absolute value exceeds the reference voltage Vcomp is output to the terminal OUT1, and finally A second induced voltage whose absolute value is less than or equal to the reference voltage Vcomp is output to the terminal OUT2.

In this case, the rotation speed calculation circuit 115 determines that the rotor 202 has rotated one step in the reverse rotation direction based on the first number of times being “1” and the second number of times being “1”. Specifically, the rotation speed calculation circuit 115 subtracts the constant "1" from the sum "2" of the first number "1" and the second number "1" to rotate in the reverse direction by "1" steps. calculate.

FIG. 12C shows a case where the rotor 202 rotates one step in the forward rotation direction from the state shown in FIG. 2 and then receives an impact and rotates two steps in the reverse rotation direction. In this case, first the second induced voltage whose absolute value exceeds the reference voltage Vcomp is output to the terminal OUT2, then the first induced voltage whose absolute value exceeds the reference voltage Vcomp is output to the terminal OUT1, The second induced voltage whose absolute value exceeds the reference voltage Vcomp is output to the terminal OUT2, and finally the first induced voltage whose absolute value is less than or equal to the reference voltage Vcomp is output to the terminal OUT1.

In this case, the rotation speed calculation circuit 115 determines that the rotor 202 has rotated two steps in the reverse rotation direction based on the first number of times being “1” and the second number of times being “2”. Specifically, the rotation speed calculation circuit 115 subtracts the constant "1" from the sum "3" of the first number "2" and the second number "1" to rotate "2" steps in the reverse direction. calculate.

From FIGS. 12B and 12C, when the rotor 202 is rotated in the reverse direction due to an impact such as a drop, the absolute value is equal to the reference voltage Vcomp every time the rotor 202 normally rotates for one step (180 degrees). It can be seen that the exceeding spike-like voltage response is detected more than once.

The rotation correction circuit 116 stops the process of outputting the drive pulse to the coil 209 for the number of forward rotations, or executes the first correction process of outputting the reverse drive pulse to the coil 209 for the number of forward rotations. For example, when the number of forward rotations is 1 or more, the rotation correction circuit 116 stops the process of outputting the drive pulse to the coil 209 in the first correction process the same number of times as the number of forward rotations. Alternatively, in the first correction process, the reverse driving pulse is output to the coil 209 the same number of times as the number of times of forward rotation. The rotation correction circuit 116 may stop the process of outputting the drive pulse to the coil 209 a number of times smaller than the number of normal rotations calculated by the rotation speed calculation circuit 115, or may cause the coil 209 to generate a number of times less than the number of normal rotations. A reverse drive pulse may be output.

Further, the rotation correction circuit 116 executes a second correction process of outputting a rotation correction pulse to the coil 209 based on the number of reverse rotations. For example, when the number of reverse rotations is 1 or more, the rotation correction circuit 116 executes the process of outputting the rotation correction pulse to the coil 209 as many times as the number of reverse rotations in the second correction processing. Here, the rotation correction pulse is a voltage pulse having a driving force equal to or higher than that of the main driving pulse.

It should be noted that the case of detecting the first induced voltage output to the terminal OUT1 and the case of detecting the second induced voltage output to the terminal OUT2 may be switched each time, and may always be the first induced voltage and the second induced voltage. Both of the induced voltages may be detected and the unnecessary detection result may be ignored. As shown in FIGS. 11 and 12, the timer time TL separates the period for detecting the first induced voltage output to the terminal OUT1 and the period for detecting the second induced voltage output to the terminal OUT2. In addition, whether the absolute value of the first induced voltage or the absolute value of the second induced voltage exceeds the reference voltage Vcomp once or multiple times during one timer time TL, the first number and the second number The number of times is “1”.

Next, an example of the operation of the timepiece according to the embodiment will be described with reference to FIG. FIG. 13 is a flowchart showing an example of processing executed by the timepiece according to the embodiment.

In step S10, the rotation direction determination circuit 114 determines whether the absolute value of the first induced voltage output to the terminal OUT1 exceeds the reference voltage Vcomp. When the rotation direction determination circuit 114 determines that the absolute value of the first induced voltage output to the terminal OUT1 exceeds the reference voltage Vcomp (step S10: Yes), the process proceeds to step S20. On the other hand, when the rotation direction determination circuit 114 determines that the absolute value of the first induced voltage output to the terminal OUT1 does not exceed the reference voltage Vcomp (step S10: No), the process proceeds to step S80.

In step S20, the rotation direction determination circuit 114 determines whether the absolute value of the second induced voltage output to the terminal OUT2 exceeds the reference voltage Vcomp after the first induced voltage according to step S10 is output. To do. When the rotation direction determination circuit 114 determines that the absolute value of the second induced voltage output to the terminal OUT2 exceeds the reference voltage Vcomp (step S20: Yes), the process proceeds to step S30. On the other hand, when the rotation direction determination circuit 114 determines that the absolute value of the second induced voltage output to the terminal OUT2 does not exceed the reference voltage Vcomp (step S20: No), the processing is ended.

In step S30, the rotation direction determination circuit 114 determines whether or not the absolute value of the first induced voltage output to the terminal OUT1 exceeds the reference voltage Vcomp after the second induced voltage in step S20 is output. To do. When the rotation direction determination circuit 114 determines that the absolute value of the first induced voltage output to the terminal OUT1 exceeds the reference voltage Vcomp (step S30: Yes), the process proceeds to step S40. On the other hand, when the rotation direction determination circuit 114 determines that the absolute value of the first induced voltage output to the terminal OUT1 does not exceed the reference voltage Vcomp (step S30: No), the process is ended.

In step S40, the rotation direction determination circuit 114 determines that the rotor 202 has rotated in the normal direction due to the impact.

In step S50, the motor drive circuit 106 executes the chopper amplification until the absolute value of the first induced voltage output to the terminal OUT1 or the absolute value of the second induced voltage output to the terminal OUT2 becomes less than the reference voltage Vcomp. ..

In step S60, the rotation speed calculation circuit 115 calculates the normal rotation frequency based on the first frequency and the second frequency.

In step S70, the rotation correction circuit 116 executes the first correction process for stopping the process of outputting the drive pulse to the coil for the number of forward rotations. Although illustration is omitted in FIG. 13, as the first correction process in step S70, the reverse drive pulse may be output to the coil for the number of times of forward rotation.

In step S80, the rotation direction determination circuit 114 determines whether or not the absolute value of the second induced voltage output to the terminal OUT2 exceeds the reference voltage Vcomp. When the rotation direction determination circuit 114 determines that the absolute value of the second induced voltage output to the terminal OUT2 exceeds the reference voltage Vcomp (step S80: Yes), the process proceeds to step S90. On the other hand, when the rotation direction determination circuit 114 determines that the absolute value of the second induced voltage output to the terminal OUT2 does not exceed the reference voltage Vcomp (step S80: No), the processing is ended.

In step S90, the rotation direction determination circuit 114 determines whether or not the absolute value of the first induced voltage output to the terminal OUT1 exceeds the reference voltage Vcomp after the second induced voltage in step S80 is output. To do. When the rotation direction determination circuit 114 determines that the absolute value of the first induced voltage output to the terminal OUT1 exceeds the reference voltage Vcomp (step S90: Yes), the process proceeds to step S100. On the other hand, when the rotation direction determination circuit 114 determines that the absolute value of the first induced voltage output to the terminal OUT1 does not exceed the reference voltage Vcomp (step S90: No), the processing is ended.

In step S100, the rotation direction determination circuit 114 determines that the rotor 202 has rotated in the reverse rotation direction due to an impact.

In step S110, the motor drive circuit 106 executes the chopper amplification until the absolute value of the first induced voltage output to the terminal OUT1 or the absolute value of the second induced voltage output to the terminal OUT2 becomes less than the reference voltage Vcomp. ..

In step S120, the rotation speed calculation circuit 115 calculates the number of times of reverse rotation based on the first number of times and the second number of times.

In step S130, the rotation correction circuit 116 executes a second correction process of outputting a rotation drive pulse to the coil based on the number of reverse rotations.

The watch 1 according to the embodiment has been described above. The timepiece 1 has a timing when the absolute value of the first induced voltage output to the terminal OUT1 exceeds the reference voltage Vcomp, and a timing when the absolute value of the second induced voltage output to the terminal OUT2 exceeds the reference voltage Vcomp. Based on the order of, the direction in which the rotor 202 rotates due to the impact is determined. For example, when the absolute value of the first induced voltage output to the terminal OUT1 first exceeds the reference voltage Vcomp, the timepiece 1 determines that the rotor 202 has rotated in the normal direction due to an impact. On the other hand, when the absolute value of the second induced voltage output to the terminal OUT2 exceeds the reference voltage Vcomp first, the timepiece 1 determines that the rotor 202 has rotated in the reverse rotation direction due to an impact.

Next, the timepiece 1 subtracts “2” from the sum of the first number of times that the absolute value of the first induced voltage exceeds the reference voltage Vcomp and the second number of times that the absolute value of the second induced voltage exceeds the reference voltage Vcomp, for example. Thus, the number of forward rotations is calculated. Further, the timepiece 1 calculates the number of times of reverse rotation by subtracting “1” from the sum of the first number of times and the second number of times, for example. Then, the timepiece 1 executes the first correction process such as stopping the process of outputting the drive pulse to the coil 209 for the number of times of forward rotation or the second correction process of outputting the rotation correction pulse to the coil 209 based on the number of times of reverse rotation. To do.

As a result, the timepiece 1 accurately grasps the direction in which the rotor 202 rotates due to the impact and the number of steps rotated in the direction, and when the rotor 202 rotates in the normal rotation direction due to the impact and the reverse rotation direction due to the impact. It is possible to perform the appropriate time correction with high accuracy in any of the cases in which the rotation has occurred.

Note that all or some of the functions of the timepiece 1 described above may be recorded as a program in a computer-readable recording medium, and this program may be executed by a computer system. The computer system includes an OS and hardware such as peripheral devices. The computer-readable recording medium is, for example, a portable medium such as a flexible disk, a magneto-optical disk, a ROM (Read Only Memory), a CD-ROM, a storage device such as a hard disk built in a computer system, the Internet, or the like. It is a volatile memory (Random Access Memory: RAM) included in a server or the like on the network. The volatile memory is an example of a recording medium that holds a program for a certain period of time.

The above-mentioned program may be transmitted to another computer system by a transmission medium, for example, a network such as the Internet or a communication line such as a telephone line.

Further, the program may be a program that realizes all or some of the functions described above. The program that realizes some of the above-described functions may be a program that can realize the above-described functions in combination with a program recorded in advance in a computer system, that is, a so-called difference program.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to the above-described embodiments, and includes design changes and the like without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1... Clock, 101... Oscillation circuit, 102... Frequency divider circuit, 103... Control circuit, 104... Main drive pulse generation circuit, 105... Correction drive pulse generation circuit, 106... Motor drive circuit, 107... Stepping motor, 108... Clock Case, 109... Analog display section, 110... Movement, 111... Pointer, 112... Calendar display section, 113... Rotation detection circuit, 114... Rotation direction determination circuit, 115... Rotation speed calculation circuit, 116... Rotation correction circuit, 201... Stator, 202... Rotor, 203... Rotor housing through hole, 204, 205... Inner notch, 206, 207... Outer notch, 208... Magnetic core, 209... Coil, Idrv... Drive current, Irs1, Irs2... Induced current, Irs3... First induced current, Irs4... Second induced current, OUT1, OUT2... Terminal, P1... Drive pulse, P2, Pr... Correction drive pulse, Rs1, Rs2... Detection resistor, r1, r2, r3, r4, r5, r6 r7, r8, r9... Locus, TN1, TN2, TP1, TP2, TP3, TP4... Transistor, Vcomp... Reference voltage

Claims (9)

A motor having a rotor for rotating the pointer clockwise in the forward rotation direction or the rotor for rotating the pointer in the reverse rotation direction which is the opposite direction to the forward rotation direction, and a coil for generating a magnetic flux for rotating the rotor;
The timing at which the absolute value of the first induced voltage flowing in the coil of the first induced current flowing in the same direction as the driving current flowing in the coil exceeds a predetermined threshold, and the second flowing in the direction opposite to the driving current. A rotation direction determination unit that determines the direction in which the rotor rotates due to an impact based on the order of the timing at which the absolute value of the second induced voltage that causes the induced current to flow through the coil exceeds the predetermined threshold value.
The rotor rotates in the forward rotation direction based on a first number of times when the absolute value of the first induced voltage exceeds the predetermined threshold value and a second number of times when the absolute value of the second induced voltage exceeds the predetermined threshold value. A rotation speed calculation unit that calculates the number of forward rotations or the number of reverse rotations in which the rotor rotates in the reverse rotation direction,
Based on the number of times of forward rotation, a process of outputting a drive pulse to the coil is stopped, or based on the number of times of forward rotation, a first correction process of outputting a drive pulse in the reverse direction to the coil, or based on the number of times of reverse rotation. A rotation correction unit that executes a second correction process of outputting a rotation correction pulse to the coil,
Clock equipped with. When the number of forward rotations is 1 or more, the rotation correction unit stops the process of outputting the drive pulse to the coil in the first correction process the same number of times as the number of forward rotations.
The timepiece according to claim 1. When the number of forward rotations is 1 or more, the rotation correction unit outputs the reverse drive pulse to the coil as many times as the number of forward rotations in the first correction processing.
The timepiece according to claim 1. When the number of reverse rotations is 1 or more, the rotation correction unit performs the process of outputting the rotation correction pulse to the coil in the second correction process the same number of times as the number of reverse rotations.
The timepiece according to any one of claims 1 to 3. The rotation speed calculation unit calculates the normal rotation frequency by subtracting 2 from the sum of the first frequency and the second frequency.
The timepiece according to any one of claims 1 to 4. The rotation speed calculation unit calculates the number of reverse rotations by subtracting 1 from the sum of the first number of times and the second number of times,
The timepiece according to any one of claims 1 to 5. The rotation direction determination unit determines that the rotor has rotated in the normal rotation direction when the absolute value of the first induced voltage exceeds the predetermined threshold value before the absolute value of the second induced voltage. ,
The timepiece according to any one of claims 1 to 6. The rotation direction determination unit determines that the rotor has rotated in the reverse rotation direction when the absolute value of the second induced voltage exceeds the predetermined threshold value before the absolute value of the first induced voltage.
The timepiece according to any one of claims 1 to 7. A first induced current that flows in the same direction as the drive current that flows in the coil that generates the magnetic flux for rotating the rotor in the forward rotation direction that rotates the pointer clockwise or in the reverse rotation direction that is the opposite direction to the normal rotation direction. When the absolute value of the first induced voltage flowing through the coil exceeds a predetermined threshold, and when the absolute value of the second induced voltage flowing through the coil of the second induced current flowing in the direction opposite to the drive current is the predetermined value. And a rotation direction determination step of determining a direction in which the rotor has rotated due to an impact, based on the order of the timing of exceeding the threshold value of
The rotor rotates in the forward rotation direction based on a first number of times when the absolute value of the first induced voltage exceeds the predetermined threshold value and a second number of times when the absolute value of the second induced voltage exceeds the predetermined threshold value. A rotation number calculation step of calculating the number of forward rotations or the number of reverse rotations in which the rotor rotates in the reverse rotation direction,
Based on the number of times of forward rotation, a process of outputting a drive pulse to the coil is stopped, or based on the number of times of forward rotation, a first correction process of outputting a drive pulse in the reverse direction to the coil, or based on the number of times of reverse rotation A rotation correction step of executing a second correction process of outputting a rotation correction pulse to the coil,
A motor control method for a timepiece including.

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